$\frac{36x^0y-6}{72x^{-1}y^{-5}}\left(3\right)$

$\left(m^{x+3}-p^2m^5\right)^2$

$\sqrt{2^{19}}\cdot7^{15}\cdot5^9$

$\frac{a-2b}{\sqrt{\sqrt{a}-\sqrt{2b}}}$

$\sin^2\left(x\right)-\cos\left(x\right)+1=0$

$144x^2y^2-168xyz+49z^2$

$\frac{\cos z^2-3\cos z+2}{\text{sen}^2z}=\frac{2-\cos z}{1+\cos z}$